Hydrochloric Acid → HCID 66593188, compound

Participants

Reaction Steps

1.1 0.8 g (5.2 mmol) of 1-hydroxybenzotriazole hydrate, 1.12 g (5.2 mmol) of D-Boc-proline, 2 g (10.4 mmol) of N-(3-dimethylamino-propyl)-N′-ethylcarbodiimide hydrochloride (DAPECI) and 1.26 ml of N-methylmorpholine are added successively to a solution of 1.0 g (5.2 mmol) of 4-(4-aminophenyl)morpholin-3-one in 25 ml of dimethylformamide, and the resultant solution is stirred at room temperature for 12 hours. The reaction solution is subsequently evaporated to dryness under reduced pressure, the residue is taken up in 10 ml of 5% sodium hydrogencarbonate solution, and the sodium hydrogencarbonate solution is extracted twice with 10 ml of ethyl acetate each time. After the combined organic phases have been dried over sodium sulfate and the solvent has been stripped off, the solid residue is triturated with 20 ml of diethyl ether, giving 1.4 g of tert-butyl 2-[4-(3-oxomorpholin-4-yl)phenylcarbamoyl]pyrrolidine-1-carboxylate as a white powder; ESI 390. 1.2 40 ml of 4N hydrochloric acid in dioxane are added to a solution of 1.4 g (3.60 mmol) of tert-butyl 2-[4-(3-oxomorpholin-4-yl)phenylcarbamoyl]pyrrolidine-1-carboxylate in 20 ml of dioxane, and the mixture is stirred at room temperature for 12 hours. The precipitate is subsequently filtered off with suction and washed successively with 10 ml of dioxane and 10 ml of diethyl ether and dried under reduced pressure, giving 1.1 g of N-[4-(3-oxomorpholin-4-yl)phenyl]pyrrolidine-2-carboxamide hydrochloride as a white powder; ESI 290. 1.3 95 mg (0.61 mmol) of 4-chlorophenyl isocyanate are added to a solution of 200 mg (0.61 mmol) of N-(4-(3-oxomorpholin-4-yl)phenyl]pyrrolidine-2-carboxamide hydrochloride and 1 ml of triethylamine in 5 ml of methylene chloride, and the reaction solution is stirred at room temperature for two hours. The reaction solution is subsequently washed with 5 ml of 1N hydrochloric acid and 5 ml of water, and the methylene chloride solution is dried over sodium sulfate. After the solvent has been stripped off under reduced pressure, the crude product is recrystallised from ethanol/diethyl ether, giving 120 mg of the title compound (“A1”) as a white powder; ESI 443; m.p. 227.6°.

Provenance & Evidence